Mercurial > repos > blastem
annotate blastem.c @ 348:3923dbc2dcc4
m68k_trap is now replaced with a generated one so it can call the generated memory acccess functions. The old static memory access functions have been removed from runtime.S
author | Mike Pavone <pavone@retrodev.com> |
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date | Tue, 21 May 2013 01:10:04 -0700 |
parents | aff29d50afd5 |
children | 2f264d2a60c2 |
rev | line source |
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1 #include "68kinst.h" |
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2 #include "m68k_to_x86.h" |
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3 #include "z80_to_x86.h" |
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4 #include "mem.h" |
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5 #include "vdp.h" |
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6 #include "render.h" |
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7 #include "blastem.h" |
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8 #include <stdio.h> |
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9 #include <stdlib.h> |
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10 #include <string.h> |
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11 |
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12 #define CARTRIDGE_WORDS 0x200000 |
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13 #define RAM_WORDS 32 * 1024 |
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14 #define Z80_RAM_BYTES 8 * 1024 |
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15 #define MCLKS_PER_68K 7 |
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16 #define MCLKS_PER_Z80 15 |
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17 //TODO: Figure out the exact value for this |
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18 #define CYCLE_NEVER 0xFFFFFFFF |
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19 #define LINES_NTSC 262 |
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20 #define LINES_PAL 312 |
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21 |
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22 uint32_t mclks_per_frame = MCLKS_LINE*LINES_NTSC; |
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23 |
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24 uint16_t cart[CARTRIDGE_WORDS]; |
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25 uint16_t ram[RAM_WORDS]; |
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26 uint8_t z80_ram[Z80_RAM_BYTES]; |
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27 |
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28 io_port gamepad_1; |
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29 io_port gamepad_2; |
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30 |
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31 int headless = 0; |
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32 int z80_enabled = 1; |
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33 int frame_limit = 1; |
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34 |
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35 #ifndef MIN |
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36 #define MIN(a,b) ((a) < (b) ? (a) : (b)) |
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37 #endif |
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38 |
166 | 39 #define SMD_HEADER_SIZE 512 |
40 #define SMD_MAGIC1 0x03 | |
41 #define SMD_MAGIC2 0xAA | |
42 #define SMD_MAGIC3 0xBB | |
43 #define SMD_BLOCK_SIZE 0x4000 | |
44 | |
45 int load_smd_rom(long filesize, FILE * f) | |
46 { | |
47 uint8_t block[SMD_BLOCK_SIZE]; | |
48 filesize -= SMD_HEADER_SIZE; | |
49 fseek(f, SMD_HEADER_SIZE, SEEK_SET); | |
50 | |
51 uint16_t * dst = cart; | |
52 while (filesize > 0) { | |
53 fread(block, 1, SMD_BLOCK_SIZE, f); | |
54 for (uint8_t *low = block, *high = (block+SMD_BLOCK_SIZE/2), *end = block+SMD_BLOCK_SIZE; high < end; high++, low++) { | |
55 *(dst++) = *high << 8 | *low; | |
56 } | |
57 filesize -= SMD_BLOCK_SIZE; | |
58 } | |
59 return 1; | |
60 } | |
61 | |
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62 int load_rom(char * filename) |
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63 { |
166 | 64 uint8_t header[10]; |
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65 FILE * f = fopen(filename, "rb"); |
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66 if (!f) { |
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67 return 0; |
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68 } |
166 | 69 fread(header, 1, sizeof(header), f); |
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70 fseek(f, 0, SEEK_END); |
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71 long filesize = ftell(f); |
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72 if (filesize/2 > CARTRIDGE_WORDS) { |
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73 //carts bigger than 4MB not currently supported |
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74 filesize = CARTRIDGE_WORDS*2; |
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75 } |
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76 fseek(f, 0, SEEK_SET); |
166 | 77 if (header[1] == SMD_MAGIC1 && header[8] == SMD_MAGIC2 && header[9] == SMD_MAGIC3) { |
78 int i; | |
79 for (i = 3; i < 8; i++) { | |
80 if (header[i] != 0) { | |
81 break; | |
82 } | |
83 } | |
84 if (i == 8) { | |
85 if (header[2]) { | |
86 fprintf(stderr, "%s is a split SMD ROM which is not currently supported", filename); | |
87 exit(1); | |
88 } | |
89 return load_smd_rom(filesize, f); | |
90 } | |
91 } | |
92 fread(cart, 2, filesize/2, f); | |
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93 fclose(f); |
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94 for(unsigned short * cur = cart; cur - cart < (filesize/2); ++cur) |
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95 { |
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96 *cur = (*cur >> 8) | (*cur << 8); |
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97 } |
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98 //TODO: Mirror ROM |
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99 return 1; |
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100 } |
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101 |
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102 uint16_t read_dma_value(uint32_t address) |
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103 { |
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104 //addresses here are word addresses (i.e. bit 0 corresponds to A1), so no need to do div by 2 |
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105 if (address < 0x200000) { |
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106 return cart[address]; |
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107 } else if(address >= 0x700000) { |
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108 return ram[address & 0x7FFF]; |
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109 } |
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110 //TODO: Figure out what happens when you try to DMA from weird adresses like IO or banked Z80 area |
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111 return 0; |
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112 } |
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113 |
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114 //TODO: Make these dependent on the video mode |
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115 //#define VINT_CYCLE ((MCLKS_LINE * 225 + (148 + 40) * 4)/MCLKS_PER_68K) |
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116 #define ZVINT_CYCLE ((MCLKS_LINE * 225 + (148 + 40) * 4)/MCLKS_PER_Z80) |
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117 //#define VINT_CYCLE ((MCLKS_LINE * 226)/MCLKS_PER_68K) |
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118 //#define ZVINT_CYCLE ((MCLKS_LINE * 226)/MCLKS_PER_Z80) |
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119 |
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120 void adjust_int_cycle(m68k_context * context, vdp_context * v_context) |
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121 { |
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122 context->int_cycle = CYCLE_NEVER; |
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123 if ((context->status & 0x7) < 6) { |
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124 uint32_t next_vint = vdp_next_vint(v_context); |
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125 if (next_vint != CYCLE_NEVER) { |
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126 next_vint /= MCLKS_PER_68K; |
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127 context->int_cycle = next_vint; |
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128 context->int_num = 6; |
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129 } |
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130 if ((context->status & 0x7) < 4) { |
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131 uint32_t next_hint = vdp_next_hint(v_context); |
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132 if (next_hint != CYCLE_NEVER) { |
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133 next_hint /= MCLKS_PER_68K; |
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134 if (next_hint < context->int_cycle) { |
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135 context->int_cycle = next_hint; |
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136 context->int_num = 4; |
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137 |
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138 } |
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139 } |
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140 } |
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141 } |
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142 |
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143 context->target_cycle = context->int_cycle < context->sync_cycle ? context->int_cycle : context->sync_cycle; |
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144 /*printf("Cyc: %d, Trgt: %d, Int Cyc: %d, Int: %d, Mask: %X, V: %d, H: %d, HICount: %d, HReg: %d, Line: %d\n", |
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145 context->current_cycle, context->target_cycle, context->int_cycle, context->int_num, (context->status & 0x7), |
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146 v_context->regs[REG_MODE_2] & 0x20, v_context->regs[REG_MODE_1] & 0x10, v_context->hint_counter, v_context->regs[REG_HINT], v_context->cycles / MCLKS_LINE);*/ |
186
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147 } |
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148 |
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149 int break_on_sync = 0; |
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150 |
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151 uint8_t reset = 1; |
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152 uint8_t need_reset = 0; |
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153 uint8_t busreq = 0; |
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154 uint8_t busack = 0; |
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155 uint32_t busack_cycle = CYCLE_NEVER; |
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156 uint8_t new_busack = 0; |
280 | 157 //#define DO_DEBUG_PRINT |
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158 #ifdef DO_DEBUG_PRINT |
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159 #define dprintf printf |
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160 #define dputs puts |
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161 #else |
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162 #define dprintf |
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163 #define dputs |
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164 #endif |
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165 |
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166 void sync_z80(z80_context * z_context, uint32_t mclks) |
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167 { |
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168 if (z80_enabled && !reset && !busreq) { |
333 | 169 genesis_context * gen = z_context->system; |
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170 if (need_reset) { |
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171 z80_reset(z_context); |
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172 need_reset = 0; |
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173 } |
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174 z_context->sync_cycle = mclks / MCLKS_PER_Z80; |
333 | 175 uint32_t vint_cycle = vdp_next_vint_z80(gen->vdp) / MCLKS_PER_Z80; |
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176 while (z_context->current_cycle < z_context->sync_cycle) { |
335 | 177 if (z_context->iff1 && z_context->current_cycle < vint_cycle) { |
178 z_context->int_cycle = vint_cycle < z_context->int_enable_cycle ? z_context->int_enable_cycle : vint_cycle; | |
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179 } |
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180 z_context->target_cycle = z_context->sync_cycle < z_context->int_cycle ? z_context->sync_cycle : z_context->int_cycle; |
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181 dprintf("Running Z80 from cycle %d to cycle %d. Native PC: %p\n", z_context->current_cycle, z_context->sync_cycle, z_context->native_pc); |
260
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182 z80_run(z_context); |
268
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183 dprintf("Z80 ran to cycle %d\n", z_context->current_cycle); |
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184 } |
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185 } else { |
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186 z_context->current_cycle = mclks / MCLKS_PER_Z80; |
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187 } |
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188 } |
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189 uint32_t frame=0; |
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190 m68k_context * sync_components(m68k_context * context, uint32_t address) |
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191 { |
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192 //TODO: Handle sync targets smaller than a single frame |
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193 genesis_context * gen = context->system; |
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194 vdp_context * v_context = gen->vdp; |
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195 z80_context * z_context = gen->z80; |
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196 uint32_t mclks = context->current_cycle * MCLKS_PER_68K; |
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197 sync_z80(z_context, mclks); |
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198 if (mclks >= mclks_per_frame) { |
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199 ym_run(gen->ym, context->current_cycle); |
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200 gen->ym->current_cycle -= mclks_per_frame/MCLKS_PER_68K; |
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201 //printf("reached frame end | 68K Cycles: %d, MCLK Cycles: %d\n", context->current_cycle, mclks); |
342
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202 vdp_run_context(v_context, mclks_per_frame); |
215
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203 if (!headless) { |
338
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204 break_on_sync |= wait_render_frame(v_context, frame_limit); |
215
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205 } |
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206 frame++; |
342
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207 mclks -= mclks_per_frame; |
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208 vdp_adjust_cycles(v_context, mclks_per_frame); |
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209 io_adjust_cycles(&gamepad_1, context->current_cycle, mclks_per_frame/MCLKS_PER_68K); |
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210 io_adjust_cycles(&gamepad_2, context->current_cycle, mclks_per_frame/MCLKS_PER_68K); |
344
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211 if (busack_cycle != CYCLE_NEVER) { |
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212 if (busack_cycle > mclks_per_frame/MCLKS_PER_68K) { |
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213 busack_cycle -= mclks_per_frame/MCLKS_PER_68K; |
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214 } else { |
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215 busack_cycle = CYCLE_NEVER; |
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216 busack = new_busack; |
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217 } |
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218 } |
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219 context->current_cycle -= mclks_per_frame/MCLKS_PER_68K; |
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220 if (z_context->current_cycle >= mclks_per_frame/MCLKS_PER_Z80) { |
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221 z_context->current_cycle -= mclks_per_frame/MCLKS_PER_Z80; |
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222 } else { |
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223 z_context->current_cycle = 0; |
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224 } |
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225 if (mclks) { |
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226 vdp_run_context(v_context, mclks); |
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227 } |
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228 } else { |
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229 //printf("running VDP for %d cycles\n", mclks - v_context->cycles); |
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230 vdp_run_context(v_context, mclks); |
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231 } |
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232 if (context->int_ack) { |
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233 vdp_int_ack(v_context, context->int_ack); |
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234 context->int_ack = 0; |
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235 } |
186
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236 adjust_int_cycle(context, v_context); |
198
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237 if (break_on_sync && address) { |
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238 break_on_sync = 0; |
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239 debugger(context, address); |
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240 } |
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241 return context; |
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242 } |
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243 |
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244 m68k_context * vdp_port_write(uint32_t vdp_port, m68k_context * context, uint16_t value) |
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245 { |
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246 if (vdp_port & 0x2700E0) { |
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247 printf("machine freeze due to write to address %X\n", 0xC00000 | vdp_port); |
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248 exit(1); |
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249 } |
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250 vdp_port &= 0x1F; |
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251 //printf("vdp_port write: %X, value: %X, cycle: %d\n", vdp_port, value, context->current_cycle); |
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252 sync_components(context, 0); |
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253 vdp_context * v_context = context->video_context; |
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254 if (vdp_port < 0x10) { |
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255 int blocked; |
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256 uint32_t before_cycle = v_context->cycles; |
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257 if (vdp_port < 4) { |
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258 while (vdp_data_port_write(v_context, value) < 0) { |
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259 while(v_context->flags & FLAG_DMA_RUN) { |
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260 vdp_run_dma_done(v_context, mclks_per_frame); |
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261 if (v_context->cycles >= mclks_per_frame) { |
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262 if (!headless) { |
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263 wait_render_frame(v_context, frame_limit); |
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264 } |
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265 vdp_adjust_cycles(v_context, mclks_per_frame); |
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266 io_adjust_cycles(&gamepad_1, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); |
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267 io_adjust_cycles(&gamepad_2, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); |
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268 if (busack_cycle != CYCLE_NEVER) { |
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269 if (busack_cycle > mclks_per_frame/MCLKS_PER_68K) { |
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270 busack_cycle -= mclks_per_frame/MCLKS_PER_68K; |
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271 } else { |
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272 busack_cycle = CYCLE_NEVER; |
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273 busack = new_busack; |
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274 } |
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275 } |
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276 } |
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277 } |
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278 context->current_cycle = v_context->cycles / MCLKS_PER_68K; |
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279 } |
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280 } else if(vdp_port < 8) { |
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281 blocked = vdp_control_port_write(v_context, value); |
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282 if (blocked) { |
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283 while (blocked) { |
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284 while(v_context->flags & FLAG_DMA_RUN) { |
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285 vdp_run_dma_done(v_context, mclks_per_frame); |
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286 if (v_context->cycles >= mclks_per_frame) { |
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287 if (!headless) { |
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288 wait_render_frame(v_context, frame_limit); |
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289 } |
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290 vdp_adjust_cycles(v_context, mclks_per_frame); |
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291 io_adjust_cycles(&gamepad_1, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); |
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292 io_adjust_cycles(&gamepad_2, v_context->cycles/MCLKS_PER_68K, mclks_per_frame/MCLKS_PER_68K); |
344
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293 if (busack_cycle != CYCLE_NEVER) { |
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294 if (busack_cycle > mclks_per_frame/MCLKS_PER_68K) { |
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295 busack_cycle -= mclks_per_frame/MCLKS_PER_68K; |
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296 } else { |
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297 busack_cycle = CYCLE_NEVER; |
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298 busack = new_busack; |
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299 } |
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300 } |
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301 } |
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302 } |
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303 if (blocked < 0) { |
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304 blocked = vdp_control_port_write(v_context, value); |
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305 } else { |
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306 blocked = 0; |
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307 } |
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308 } |
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309 context->current_cycle = v_context->cycles / MCLKS_PER_68K; |
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310 } else { |
186
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311 adjust_int_cycle(context, v_context); |
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312 } |
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313 } else { |
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314 printf("Illegal write to HV Counter port %X\n", vdp_port); |
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315 exit(1); |
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316 } |
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317 if (v_context->cycles != before_cycle) { |
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318 context->current_cycle = v_context->cycles / MCLKS_PER_68K; |
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319 } |
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320 } else if (vdp_port < 0x18) { |
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321 //TODO: Implement PSG |
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322 } else { |
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323 //TODO: Implement undocumented test register(s) |
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324 } |
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325 return context; |
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326 } |
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327 |
343
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328 m68k_context * vdp_port_write_b(uint32_t vdp_port, m68k_context * context, uint8_t value) |
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329 { |
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330 return vdp_port_write(vdp_port, context, value | value << 8); |
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331 } |
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332 |
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333 uint16_t vdp_port_read(uint32_t vdp_port, m68k_context * context) |
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334 { |
343
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335 if (vdp_port & 0x2700E0) { |
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336 printf("machine freeze due to read from address %X\n", 0xC00000 | vdp_port); |
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337 exit(1); |
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338 } |
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339 vdp_port &= 0x1F; |
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340 uint16_t value; |
198
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341 sync_components(context, 0); |
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342 vdp_context * v_context = context->video_context; |
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343 if (vdp_port < 0x10) { |
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344 if (vdp_port < 4) { |
343
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345 value = vdp_data_port_read(v_context); |
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346 } else if(vdp_port < 8) { |
343
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347 value = vdp_control_port_read(v_context); |
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348 } else { |
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349 value = vdp_hv_counter_read(v_context); |
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350 //printf("HV Counter: %X at cycle %d\n", value, v_context->cycles); |
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351 } |
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352 context->current_cycle = v_context->cycles/MCLKS_PER_68K; |
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353 } else { |
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354 printf("Illegal read from PSG or test register port %X\n", vdp_port); |
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355 exit(1); |
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356 } |
343
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357 return value; |
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358 } |
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359 |
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360 uint8_t vdp_port_read_b(uint32_t vdp_port, m68k_context * context) |
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361 { |
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362 uint16_t value = vdp_port_read(vdp_port, context); |
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363 if (vdp_port & 1) { |
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364 return value; |
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365 } else { |
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366 return value >> 8; |
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367 } |
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368 } |
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369 |
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370 #define TH 0x40 |
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371 #define TH_TIMEOUT 8000 |
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372 |
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373 void io_adjust_cycles(io_port * pad, uint32_t current_cycle, uint32_t deduction) |
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374 { |
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375 /*uint8_t control = pad->control | 0x80; |
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376 uint8_t th = control & pad->output; |
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377 if (pad->input[GAMEPAD_TH0] || pad->input[GAMEPAD_TH1]) { |
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378 printf("adjust_cycles | control: %X, TH: %X, GAMEPAD_TH0: %X, GAMEPAD_TH1: %X, TH Counter: %d, Timeout: %d, Cycle: %d\n", control, th, pad->input[GAMEPAD_TH0], pad->input[GAMEPAD_TH1], pad->th_counter,pad->timeout_cycle, current_cycle); |
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379 }*/ |
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380 if (current_cycle >= pad->timeout_cycle) { |
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381 pad->th_counter = 0; |
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382 } else { |
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383 pad->timeout_cycle -= deduction; |
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384 } |
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385 if (busack_cycle < CYCLE_NEVER && current_cycle < busack_cycle) { |
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386 busack_cycle -= deduction; |
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387 } |
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388 } |
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389 |
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390 void io_data_write(io_port * pad, m68k_context * context, uint8_t value) |
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391 { |
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392 if (pad->control & TH) { |
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393 //check if TH has changed |
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394 if ((pad->output & TH) ^ (value & TH)) { |
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395 if (context->current_cycle >= pad->timeout_cycle) { |
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396 pad->th_counter = 0; |
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397 } |
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398 if (!(value & TH)) { |
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399 pad->th_counter++; |
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400 } |
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401 pad->timeout_cycle = context->current_cycle + TH_TIMEOUT; |
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402 } |
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403 } |
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404 pad->output = value; |
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405 } |
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406 |
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407 uint8_t io_data_read(io_port * pad, m68k_context * context) |
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408 { |
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409 uint8_t control = pad->control | 0x80; |
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410 uint8_t th = control & pad->output; |
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411 uint8_t input; |
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412 if (context->current_cycle >= pad->timeout_cycle) { |
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413 pad->th_counter = 0; |
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414 } |
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415 /*if (pad->input[GAMEPAD_TH0] || pad->input[GAMEPAD_TH1]) { |
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416 printf("io_data_read | control: %X, TH: %X, GAMEPAD_TH0: %X, GAMEPAD_TH1: %X, TH Counter: %d, Timeout: %d, Cycle: %d\n", control, th, pad->input[GAMEPAD_TH0], pad->input[GAMEPAD_TH1], pad->th_counter,pad->timeout_cycle, context->current_cycle); |
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417 }*/ |
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418 if (th) { |
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419 if (pad->th_counter == 3) { |
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420 input = pad->input[GAMEPAD_EXTRA]; |
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421 } else { |
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422 input = pad->input[GAMEPAD_TH1]; |
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423 } |
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424 } else { |
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425 if (pad->th_counter == 3) { |
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426 input = pad->input[GAMEPAD_TH0] | 0xF; |
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427 } else if(pad->th_counter == 4) { |
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428 input = pad->input[GAMEPAD_TH0] & 0x30; |
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429 } else { |
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430 input = pad->input[GAMEPAD_TH0] | 0xC; |
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431 } |
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432 } |
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433 uint8_t value = ((~input) & (~control)) | (pad->output & control); |
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434 /*if (pad->input[GAMEPAD_TH0] || pad->input[GAMEPAD_TH1]) { |
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435 printf ("value: %X\n", value); |
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436 }*/ |
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437 return value; |
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438 } |
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439 |
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440 uint32_t zram_counter = 0; |
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441 #define Z80_ACK_DELAY 3 |
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442 #define Z80_BUSY_DELAY 1//TODO: Find the actual value for this |
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443 #define Z80_REQ_BUSY 1 |
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444 #define Z80_REQ_ACK 0 |
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445 #define Z80_RES_BUSACK reset |
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446 |
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447 m68k_context * io_write(uint32_t location, m68k_context * context, uint8_t value) |
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448 { |
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449 genesis_context * gen = context->system; |
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450 if (location < 0x10000) { |
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451 if (busack_cycle <= context->current_cycle) { |
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452 busack = new_busack; |
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453 busack_cycle = CYCLE_NEVER; |
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454 } |
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455 if (!(busack || reset)) { |
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456 location &= 0x7FFF; |
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457 if (location < 0x4000) { |
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458 z80_ram[location & 0x1FFF] = value; |
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459 z80_handle_code_write(location & 0x1FFF, gen->z80); |
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460 } else if (location < 0x6000) { |
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461 ym_run(gen->ym, context->current_cycle); |
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462 if (location & 1) { |
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463 ym_data_write(gen->ym, value); |
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464 } else if(location & 2) { |
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465 ym_address_write_part2(gen->ym, value); |
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466 } else { |
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467 ym_address_write_part1(gen->ym, value); |
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468 } |
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469 } |
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470 } |
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471 } else { |
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472 location &= 0x1FFF; |
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473 if (location < 0x100) { |
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474 switch(location/2) |
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475 { |
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476 case 0x1: |
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477 io_data_write(&gamepad_1, context, value); |
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478 break; |
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479 case 0x2: |
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480 io_data_write(&gamepad_2, context, value); |
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481 break; |
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482 case 0x3://PORT C Data |
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483 break; |
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484 case 0x4: |
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485 gamepad_1.control = value; |
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486 break; |
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|
487 case 0x5: |
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|
488 gamepad_2.control = value; |
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|
489 break; |
88
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|
490 } |
153
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|
491 } else { |
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|
492 if (location == 0x1100) { |
288
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493 sync_z80(gen->z80, context->current_cycle * MCLKS_PER_68K); |
336
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494 if (busack_cycle <= context->current_cycle) { |
153
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diff
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495 busack = new_busack; |
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diff
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496 busack_cycle = CYCLE_NEVER; |
88
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497 } |
153
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498 if (value & 1) { |
271
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499 dputs("bus requesting Z80"); |
336
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diff
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500 |
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501 if(!reset && !busreq) { |
289
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288
diff
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502 busack_cycle = ((gen->z80->current_cycle + Z80_ACK_DELAY) * MCLKS_PER_Z80) / MCLKS_PER_68K;//context->current_cycle + Z80_ACK_DELAY; |
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288
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503 new_busack = Z80_REQ_ACK; |
336
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504 busreq = 1; |
153
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505 } |
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506 } else { |
260
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507 if (busreq) { |
271
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508 dputs("releasing z80 bus"); |
280 | 509 #ifdef DO_DEBUG_PRINT |
279
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510 char fname[20]; |
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511 sprintf(fname, "zram-%d", zram_counter++); |
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512 FILE * f = fopen(fname, "wb"); |
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513 fwrite(z80_ram, 1, sizeof(z80_ram), f); |
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514 fclose(f); |
280 | 515 #endif |
336
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diff
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516 busack_cycle = ((gen->z80->current_cycle + Z80_BUSY_DELAY) * MCLKS_PER_Z80) / MCLKS_PER_68K; |
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517 new_busack = Z80_REQ_BUSY; |
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518 busreq = 0; |
260
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diff
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519 } |
289
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520 //busack_cycle = CYCLE_NEVER; |
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|
521 //busack = Z80_REQ_BUSY; |
336
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diff
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|
522 |
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523 } |
153
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diff
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524 } else if (location == 0x1200) { |
288
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525 sync_z80(gen->z80, context->current_cycle * MCLKS_PER_68K); |
153
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149
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526 if (value & 1) { |
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149
diff
changeset
|
527 if (reset && busreq) { |
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149
diff
changeset
|
528 new_busack = 0; |
289
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529 busack_cycle = ((gen->z80->current_cycle + Z80_ACK_DELAY) * MCLKS_PER_Z80) / MCLKS_PER_68K;//context->current_cycle + Z80_ACK_DELAY; |
153
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530 } |
260
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|
531 //TODO: Deal with the scenario in which reset is not asserted long enough |
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532 if (reset) { |
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|
533 need_reset = 1; |
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534 //TODO: Add necessary delay between release of reset and start of execution |
288
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535 gen->z80->current_cycle = (context->current_cycle * MCLKS_PER_68K) / MCLKS_PER_Z80; |
260
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536 } |
153
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diff
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|
537 reset = 0; |
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|
538 } else { |
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diff
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|
539 reset = 1; |
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|
540 } |
88
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diff
changeset
|
541 } |
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diff
changeset
|
542 } |
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diff
changeset
|
543 } |
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diff
changeset
|
544 return context; |
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diff
changeset
|
545 } |
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diff
changeset
|
546 |
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diff
changeset
|
547 m68k_context * io_write_w(uint32_t location, m68k_context * context, uint16_t value) |
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diff
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|
548 { |
288
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280
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|
549 genesis_context * gen = context->system; |
153
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diff
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|
550 if (location < 0x10000) { |
336
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parents:
335
diff
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|
551 if (busack_cycle <= context->current_cycle) { |
153
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149
diff
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|
552 busack = new_busack; |
42c031184e8a
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diff
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|
553 busack_cycle = CYCLE_NEVER; |
42c031184e8a
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parents:
149
diff
changeset
|
554 } |
42c031184e8a
Implement access to Z80 RAM
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149
diff
changeset
|
555 if (!(busack || reset)) { |
42c031184e8a
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149
diff
changeset
|
556 location &= 0x7FFF; |
42c031184e8a
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149
diff
changeset
|
557 if (location < 0x4000) { |
42c031184e8a
Implement access to Z80 RAM
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149
diff
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|
558 z80_ram[location & 0x1FFE] = value >> 8; |
288
a8ee7934a1f8
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Mike Pavone <pavone@retrodev.com>
parents:
280
diff
changeset
|
559 z80_handle_code_write(location & 0x1FFE, gen->z80); |
a8ee7934a1f8
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parents:
280
diff
changeset
|
560 } else if (location < 0x6000) { |
a8ee7934a1f8
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parents:
280
diff
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|
561 ym_run(gen->ym, context->current_cycle); |
a8ee7934a1f8
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280
diff
changeset
|
562 if (location & 1) { |
a8ee7934a1f8
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parents:
280
diff
changeset
|
563 ym_data_write(gen->ym, value >> 8); |
a8ee7934a1f8
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Mike Pavone <pavone@retrodev.com>
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280
diff
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|
564 } else if(location & 2) { |
a8ee7934a1f8
Add a YM2612 stub implementation with just timers and status registers so that games that depend on it can run.
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parents:
280
diff
changeset
|
565 ym_address_write_part2(gen->ym, value >> 8); |
a8ee7934a1f8
Add a YM2612 stub implementation with just timers and status registers so that games that depend on it can run.
Mike Pavone <pavone@retrodev.com>
parents:
280
diff
changeset
|
566 } else { |
a8ee7934a1f8
Add a YM2612 stub implementation with just timers and status registers so that games that depend on it can run.
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parents:
280
diff
changeset
|
567 ym_address_write_part1(gen->ym, value >> 8); |
a8ee7934a1f8
Add a YM2612 stub implementation with just timers and status registers so that games that depend on it can run.
Mike Pavone <pavone@retrodev.com>
parents:
280
diff
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|
568 } |
153
42c031184e8a
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Mike Pavone <pavone@retrodev.com>
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149
diff
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|
569 } |
88
c339559f1d4f
Forgot to add blastem main file earlier
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
570 } |
c339559f1d4f
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Mike Pavone <pavone@retrodev.com>
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diff
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|
571 } else { |
153
42c031184e8a
Implement access to Z80 RAM
Mike Pavone <pavone@retrodev.com>
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149
diff
changeset
|
572 location &= 0x1FFF; |
42c031184e8a
Implement access to Z80 RAM
Mike Pavone <pavone@retrodev.com>
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149
diff
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|
573 if (location < 0x100) { |
42c031184e8a
Implement access to Z80 RAM
Mike Pavone <pavone@retrodev.com>
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149
diff
changeset
|
574 switch(location/2) |
42c031184e8a
Implement access to Z80 RAM
Mike Pavone <pavone@retrodev.com>
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149
diff
changeset
|
575 { |
42c031184e8a
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Mike Pavone <pavone@retrodev.com>
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149
diff
changeset
|
576 case 0x1: |
42c031184e8a
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149
diff
changeset
|
577 io_data_write(&gamepad_1, context, value); |
42c031184e8a
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parents:
149
diff
changeset
|
578 break; |
42c031184e8a
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149
diff
changeset
|
579 case 0x2: |
42c031184e8a
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149
diff
changeset
|
580 io_data_write(&gamepad_2, context, value); |
42c031184e8a
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parents:
149
diff
changeset
|
581 break; |
42c031184e8a
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parents:
149
diff
changeset
|
582 case 0x3://PORT C Data |
42c031184e8a
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Mike Pavone <pavone@retrodev.com>
parents:
149
diff
changeset
|
583 break; |
42c031184e8a
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Mike Pavone <pavone@retrodev.com>
parents:
149
diff
changeset
|
584 case 0x4: |
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parents:
149
diff
changeset
|
585 gamepad_1.control = value; |
42c031184e8a
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Mike Pavone <pavone@retrodev.com>
parents:
149
diff
changeset
|
586 break; |
42c031184e8a
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Mike Pavone <pavone@retrodev.com>
parents:
149
diff
changeset
|
587 case 0x5: |
42c031184e8a
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Mike Pavone <pavone@retrodev.com>
parents:
149
diff
changeset
|
588 gamepad_2.control = value; |
42c031184e8a
Implement access to Z80 RAM
Mike Pavone <pavone@retrodev.com>
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149
diff
changeset
|
589 break; |
88
c339559f1d4f
Forgot to add blastem main file earlier
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parents:
diff
changeset
|
590 } |
153
42c031184e8a
Implement access to Z80 RAM
Mike Pavone <pavone@retrodev.com>
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149
diff
changeset
|
591 } else { |
42c031184e8a
Implement access to Z80 RAM
Mike Pavone <pavone@retrodev.com>
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149
diff
changeset
|
592 //printf("IO Write of %X to %X @ %d\n", value, location, context->current_cycle); |
42c031184e8a
Implement access to Z80 RAM
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149
diff
changeset
|
593 if (location == 0x1100) { |
288
a8ee7934a1f8
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Mike Pavone <pavone@retrodev.com>
parents:
280
diff
changeset
|
594 sync_z80(gen->z80, context->current_cycle * MCLKS_PER_68K); |
336
87b65e5ce1ab
Fix a stupid bug in z80 busreq acknowledge delay code and make some small improvements there too
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parents:
335
diff
changeset
|
595 if (busack_cycle <= context->current_cycle) { |
153
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parents:
149
diff
changeset
|
596 busack = new_busack; |
42c031184e8a
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Mike Pavone <pavone@retrodev.com>
parents:
149
diff
changeset
|
597 busack_cycle = CYCLE_NEVER; |
88
c339559f1d4f
Forgot to add blastem main file earlier
Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
598 } |
153
42c031184e8a
Implement access to Z80 RAM
Mike Pavone <pavone@retrodev.com>
parents:
149
diff
changeset
|
599 if (value & 0x100) { |
271
969ee17471c5
Protect debug prints for busreq/reset regs with appropriate macros
Mike Pavone <pavone@retrodev.com>
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268
diff
changeset
|
600 dprintf("bus requesting Z80 @ %d\n", (context->current_cycle * MCLKS_PER_68K) / MCLKS_PER_Z80); |
336
87b65e5ce1ab
Fix a stupid bug in z80 busreq acknowledge delay code and make some small improvements there too
Mike Pavone <pavone@retrodev.com>
parents:
335
diff
changeset
|
601 |
87b65e5ce1ab
Fix a stupid bug in z80 busreq acknowledge delay code and make some small improvements there too
Mike Pavone <pavone@retrodev.com>
parents:
335
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602 if(!reset && !busreq) { |
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603 busack_cycle = ((gen->z80->current_cycle + Z80_ACK_DELAY) * MCLKS_PER_Z80) / MCLKS_PER_68K;//context->current_cycle + Z80_ACK_DELAY; |
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604 new_busack = Z80_REQ_ACK; |
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605 busreq = 1; |
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606 } |
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607 } else { |
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608 if (busreq) { |
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609 dprintf("releasing Z80 bus @ %d\n", (context->current_cycle * MCLKS_PER_68K) / MCLKS_PER_Z80); |
280 | 610 #ifdef DO_DEBUG_PRINT |
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611 char fname[20]; |
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612 sprintf(fname, "zram-%d", zram_counter++); |
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613 FILE * f = fopen(fname, "wb"); |
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614 fwrite(z80_ram, 1, sizeof(z80_ram), f); |
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615 fclose(f); |
280 | 616 #endif |
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617 busack_cycle = ((gen->z80->current_cycle + Z80_BUSY_DELAY) * MCLKS_PER_Z80) / MCLKS_PER_68K; |
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618 new_busack = Z80_REQ_BUSY; |
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619 busreq = 0; |
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620 } |
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621 //busack_cycle = CYCLE_NEVER; |
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622 //busack = Z80_REQ_BUSY; |
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623 } |
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624 } else if (location == 0x1200) { |
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625 sync_z80(gen->z80, context->current_cycle * MCLKS_PER_68K); |
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626 if (value & 0x100) { |
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627 if (reset && busreq) { |
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628 new_busack = 0; |
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629 busack_cycle = ((gen->z80->current_cycle + Z80_ACK_DELAY) * MCLKS_PER_Z80) / MCLKS_PER_68K;//context->current_cycle + Z80_ACK_DELAY; |
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630 } |
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631 //TODO: Deal with the scenario in which reset is not asserted long enough |
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632 if (reset) { |
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633 need_reset = 1; |
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634 //TODO: Add necessary delay between release of reset and start of execution |
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635 gen->z80->current_cycle = (context->current_cycle * MCLKS_PER_68K) / MCLKS_PER_Z80; |
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636 } |
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637 reset = 0; |
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638 } else { |
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639 reset = 1; |
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640 } |
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641 } |
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642 } |
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643 } |
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644 return context; |
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645 } |
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646 |
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647 #define USA 0x80 |
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648 #define JAP 0x00 |
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649 #define EUR 0xC0 |
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650 #define NO_DISK 0x20 |
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651 uint8_t version_reg = NO_DISK | USA; |
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652 |
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653 uint8_t io_read(uint32_t location, m68k_context * context) |
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654 { |
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655 uint8_t value; |
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656 genesis_context *gen = context->system; |
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657 if (location < 0x10000) { |
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658 if (busack_cycle <= context->current_cycle) { |
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659 busack = new_busack; |
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660 busack_cycle = CYCLE_NEVER; |
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661 } |
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662 if (!(busack==Z80_REQ_BUSY || reset)) { |
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663 location &= 0x7FFF; |
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664 if (location < 0x4000) { |
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665 value = z80_ram[location & 0x1FFF]; |
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666 } else if (location < 0x6000) { |
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667 ym_run(gen->ym, context->current_cycle); |
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668 value = ym_read_status(gen->ym); |
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669 } else { |
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670 value = 0xFF; |
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671 } |
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672 } else { |
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673 value = 0xFF; |
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674 } |
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675 } else { |
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676 location &= 0x1FFF; |
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677 if (location < 0x100) { |
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678 switch(location/2) |
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679 { |
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680 case 0x0: |
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681 //version bits should be 0 for now since we're not emulating TMSS |
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682 value = version_reg; |
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683 break; |
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684 case 0x1: |
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685 value = io_data_read(&gamepad_1, context); |
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686 break; |
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687 case 0x2: |
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688 value = io_data_read(&gamepad_2, context); |
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689 break; |
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690 case 0x3://PORT C Data |
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691 break; |
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692 case 0x4: |
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693 value = gamepad_1.control; |
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694 break; |
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695 case 0x5: |
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696 value = gamepad_2.control; |
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697 break; |
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698 default: |
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699 value = 0xFF; |
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700 } |
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701 } else { |
343
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702 if (location == 0x1100) { |
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703 if (busack_cycle <= context->current_cycle) { |
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704 busack = new_busack; |
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705 busack_cycle = CYCLE_NEVER; |
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706 } |
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707 value = Z80_RES_BUSACK || busack; |
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708 dprintf("Byte read of BUSREQ returned %d @ %d (reset: %d, busack: %d, busack_cycle %d)\n", value, context->current_cycle, reset, busack, busack_cycle); |
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709 } else if (location == 0x1200) { |
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710 value = !reset; |
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711 } else { |
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712 value = 0xFF; |
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713 printf("Byte read of unknown IO location: %X\n", location); |
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714 } |
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715 } |
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716 } |
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717 return value; |
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718 } |
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719 |
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720 uint16_t io_read_w(uint32_t location, m68k_context * context) |
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721 { |
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722 uint16_t value; |
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723 genesis_context * gen = context->system; |
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724 if (location < 0x10000) { |
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725 if (busack_cycle <= context->current_cycle) { |
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726 busack = new_busack; |
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727 busack_cycle = CYCLE_NEVER; |
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728 } |
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729 if (!(busack==Z80_REQ_BUSY || reset)) { |
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730 location &= 0x7FFF; |
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731 if (location < 0x4000) { |
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732 value = z80_ram[location & 0x1FFE]; |
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733 } else if (location < 0x6000) { |
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734 ym_run(gen->ym, context->current_cycle); |
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735 value = ym_read_status(gen->ym); |
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736 } else { |
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737 value = 0xFF; |
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738 } |
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739 value = value | (value << 8); |
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740 } else { |
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741 value = 0xFFFF; |
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742 } |
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743 } else { |
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744 location &= 0x1FFF; |
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745 if (location < 0x100) { |
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746 switch(location/2) |
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747 { |
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748 case 0x0: |
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749 //version bits should be 0 for now since we're not emulating TMSS |
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750 //Not sure about the other bits |
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751 value = version_reg; |
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752 break; |
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753 case 0x1: |
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754 value = io_data_read(&gamepad_1, context); |
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755 break; |
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756 case 0x2: |
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757 value = io_data_read(&gamepad_2, context); |
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758 break; |
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759 case 0x3://PORT C Data |
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760 break; |
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761 case 0x4: |
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762 value = gamepad_1.control; |
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763 break; |
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764 case 0x5: |
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765 value = gamepad_2.control; |
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766 break; |
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767 case 0x6: |
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768 //PORT C Control |
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769 value = 0; |
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770 break; |
343
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771 default: |
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772 value = 0; |
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773 } |
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774 value = value | (value << 8); |
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775 //printf("Word read to %X returned %d\n", location, value); |
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776 } else { |
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777 if (location == 0x1100) { |
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778 if (busack_cycle <= context->current_cycle) { |
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779 busack = new_busack; |
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780 busack_cycle = CYCLE_NEVER; |
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781 } |
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782 value = (Z80_RES_BUSACK || busack) << 8; |
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783 //printf("Word read of BUSREQ returned %d\n", value); |
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784 } else if (location == 0x1200) { |
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785 value = (!reset) << 8; |
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786 } else { |
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|
787 printf("Word read of unknown IO location: %X\n", location); |
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788 } |
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789 } |
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|
790 } |
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|
791 return value; |
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792 } |
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|
793 |
290
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|
794 z80_context * z80_write_ym(uint16_t location, z80_context * context, uint8_t value) |
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795 { |
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|
796 genesis_context * gen = context->system; |
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797 ym_run(gen->ym, (context->current_cycle * MCLKS_PER_Z80) / MCLKS_PER_68K); |
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798 if (location & 1) { |
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|
799 ym_data_write(gen->ym, value); |
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800 } else if (location & 2) { |
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801 ym_address_write_part2(gen->ym, value); |
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802 } else { |
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|
803 ym_address_write_part1(gen->ym, value); |
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|
804 } |
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|
805 return context; |
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|
806 } |
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807 |
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808 uint8_t z80_read_ym(uint16_t location, z80_context * context) |
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809 { |
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|
810 genesis_context * gen = context->system; |
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811 ym_run(gen->ym, (context->current_cycle * MCLKS_PER_Z80) / MCLKS_PER_68K); |
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812 return ym_read_status(gen->ym); |
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813 } |
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814 |
184
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|
815 typedef struct bp_def { |
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816 struct bp_def * next; |
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817 uint32_t address; |
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818 uint32_t index; |
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819 } bp_def; |
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820 |
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821 bp_def * breakpoints = NULL; |
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822 uint32_t bp_index = 0; |
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823 |
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824 bp_def ** find_breakpoint(bp_def ** cur, uint32_t address) |
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825 { |
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826 while (*cur) { |
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827 if ((*cur)->address == address) { |
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828 break; |
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829 } |
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830 cur = &((*cur)->next); |
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831 } |
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832 return cur; |
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833 } |
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834 |
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|
835 bp_def ** find_breakpoint_idx(bp_def ** cur, uint32_t index) |
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836 { |
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837 while (*cur) { |
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838 if ((*cur)->index == index) { |
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839 break; |
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840 } |
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|
841 cur = &((*cur)->next); |
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842 } |
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843 return cur; |
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844 } |
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845 |
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846 char * find_param(char * buf) |
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847 { |
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848 for (; *buf; buf++) { |
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849 if (*buf == ' ') { |
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850 if (*(buf+1)) { |
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851 return buf+1; |
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852 } |
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853 } |
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854 } |
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855 return NULL; |
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856 } |
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857 |
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858 void strip_nl(char * buf) |
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859 { |
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860 for(; *buf; buf++) { |
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861 if (*buf == '\n') { |
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862 *buf = 0; |
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863 return; |
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864 } |
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865 } |
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866 } |
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867 |
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868 m68k_context * debugger(m68k_context * context, uint32_t address) |
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869 { |
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870 static char last_cmd[1024]; |
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871 char input_buf[1024]; |
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872 static uint32_t branch_t; |
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873 static uint32_t branch_f; |
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874 m68kinst inst; |
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875 //probably not necessary, but let's play it safe |
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876 address &= 0xFFFFFF; |
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877 if (address == branch_t) { |
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878 bp_def ** f_bp = find_breakpoint(&breakpoints, branch_f); |
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879 if (!*f_bp) { |
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880 remove_breakpoint(context, branch_f); |
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881 } |
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882 branch_t = branch_f = 0; |
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883 } else if(address == branch_f) { |
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884 bp_def ** t_bp = find_breakpoint(&breakpoints, branch_t); |
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885 if (!*t_bp) { |
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886 remove_breakpoint(context, branch_t); |
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887 } |
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888 branch_t = branch_f = 0; |
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889 } |
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890 //Check if this is a user set breakpoint, or just a temporary one |
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891 bp_def ** this_bp = find_breakpoint(&breakpoints, address); |
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892 if (*this_bp) { |
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893 printf("Breakpoint %d hit\n", (*this_bp)->index); |
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894 } else { |
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895 remove_breakpoint(context, address); |
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896 } |
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897 uint16_t * pc; |
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898 if (address < 0x400000) { |
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|
899 pc = cart + address/2; |
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900 } else if(address > 0xE00000) { |
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901 pc = ram + (address & 0xFFFF)/2; |
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902 } else { |
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903 fprintf(stderr, "Entered debugger at address %X\n", address); |
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904 exit(1); |
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905 } |
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906 uint16_t * after_pc = m68k_decode(pc, &inst, address); |
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907 m68k_disasm(&inst, input_buf); |
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908 printf("%X: %s\n", address, input_buf); |
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|
909 uint32_t after = address + (after_pc-pc)*2; |
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910 int debugging = 1; |
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911 while (debugging) { |
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912 fputs(">", stdout); |
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Fix a bunch of bugs in the CPU core, add a 68K debugger
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913 if (!fgets(input_buf, sizeof(input_buf), stdin)) { |
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914 fputs("fgets failed", stderr); |
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915 break; |
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916 } |
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|
917 strip_nl(input_buf); |
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|
918 //hitting enter repeats last command |
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|
919 if (input_buf[0]) { |
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920 strcpy(last_cmd, input_buf); |
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921 } else { |
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922 strcpy(input_buf, last_cmd); |
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923 } |
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924 char * param; |
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925 char format[8]; |
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926 uint32_t value; |
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927 bp_def * new_bp; |
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928 switch(input_buf[0]) |
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929 { |
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930 case 'c': |
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|
931 puts("Continuing"); |
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932 debugging = 0; |
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|
933 break; |
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|
934 case 'b': |
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935 param = find_param(input_buf); |
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936 if (!param) { |
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937 fputs("b command requires a parameter\n", stderr); |
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|
938 break; |
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939 } |
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940 value = strtol(param, NULL, 16); |
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|
941 insert_breakpoint(context, value, (uint8_t *)debugger); |
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|
942 new_bp = malloc(sizeof(bp_def)); |
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|
943 new_bp->next = breakpoints; |
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|
944 new_bp->address = value; |
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|
945 new_bp->index = bp_index++; |
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|
946 breakpoints = new_bp; |
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|
947 printf("Breakpoint %d set at %X\n", new_bp->index, value); |
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|
948 break; |
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|
949 case 'a': |
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|
950 param = find_param(input_buf); |
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|
951 if (!param) { |
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|
952 fputs("a command requires a parameter\n", stderr); |
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|
953 break; |
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|
954 } |
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955 value = strtol(param, NULL, 16); |
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956 insert_breakpoint(context, value, (uint8_t *)debugger); |
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957 debugging = 0; |
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958 break; |
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959 case 'd': |
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960 param = find_param(input_buf); |
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961 if (!param) { |
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962 fputs("b command requires a parameter\n", stderr); |
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963 break; |
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964 } |
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965 value = atoi(param); |
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966 this_bp = find_breakpoint_idx(&breakpoints, value); |
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967 if (!*this_bp) { |
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968 fprintf(stderr, "Breakpoint %d does not exist\n", value); |
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969 break; |
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970 } |
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971 new_bp = *this_bp; |
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972 *this_bp = (*this_bp)->next; |
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973 free(new_bp); |
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974 break; |
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975 case 'p': |
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976 strcpy(format, "%s: %d\n"); |
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977 if (input_buf[1] == '/') { |
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978 switch (input_buf[2]) |
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979 { |
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980 case 'x': |
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981 case 'X': |
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982 case 'd': |
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983 case 'c': |
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984 format[5] = input_buf[2]; |
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985 break; |
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986 default: |
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987 fprintf(stderr, "Unrecognized format character: %c\n", input_buf[2]); |
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988 } |
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989 } |
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990 param = find_param(input_buf); |
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991 if (!param) { |
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992 fputs("p command requires a parameter\n", stderr); |
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993 break; |
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994 } |
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995 if (param[0] == 'd' && param[1] >= '0' && param[1] <= '7') { |
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996 value = context->dregs[param[1]-'0']; |
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997 } else if (param[0] == 'a' && param[1] >= '0' && param[1] <= '7') { |
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998 value = context->aregs[param[1]-'0']; |
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999 } else if (param[0] == 'S' && param[1] == 'R') { |
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1000 value = (context->status << 8); |
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1001 for (int flag = 0; flag < 5; flag++) { |
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1002 value |= context->flags[flag] << (4-flag); |
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1003 } |
185
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1004 } else if(param[0] == 'c') { |
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1005 value = context->current_cycle; |
184
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1006 } else if (param[0] == '0' && param[1] == 'x') { |
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1007 uint32_t p_addr = strtol(param+2, NULL, 16); |
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1008 value = read_dma_value(p_addr/2); |
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1009 } else { |
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1010 fprintf(stderr, "Unrecognized parameter to p: %s\n", param); |
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1011 break; |
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1012 } |
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1013 printf(format, param, value); |
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1014 break; |
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1015 case 'n': |
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1016 //TODO: Deal with jmp, dbcc, rtr and rte |
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1017 if (inst.op == M68K_RTS) { |
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1018 after = (read_dma_value(context->aregs[7]/2) << 16) | read_dma_value(context->aregs[7]/2 + 1); |
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1019 } else if(inst.op == M68K_BCC && inst.extra.cond != COND_FALSE) { |
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1020 if (inst.extra.cond = COND_TRUE) { |
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1021 after = inst.address + 2 + inst.src.params.immed; |
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1022 } else { |
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1023 branch_f = after; |
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1024 branch_t = inst.address + 2 + inst.src.params.immed; |
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1025 insert_breakpoint(context, branch_t, (uint8_t *)debugger); |
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1026 } |
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1027 } |
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|
1028 insert_breakpoint(context, after, (uint8_t *)debugger); |
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1029 debugging = 0; |
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|
1030 break; |
327
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|
1031 case 'v': { |
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|
1032 genesis_context * gen = context->system; |
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|
1033 //VDP debug commands |
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|
1034 switch(input_buf[1]) |
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|
1035 { |
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|
1036 case 's': |
1b00258b1f29
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|
1037 vdp_print_sprite_table(gen->vdp); |
1b00258b1f29
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|
1038 break; |
1b00258b1f29
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|
1039 case 'r': |
1b00258b1f29
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|
1040 vdp_print_reg_explain(gen->vdp); |
1b00258b1f29
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|
1041 break; |
1b00258b1f29
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|
1042 } |
1b00258b1f29
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|
1043 break; |
1b00258b1f29
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|
1044 } |
184
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|
1045 case 'q': |
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|
1046 puts("Quitting"); |
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|
1047 exit(0); |
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1048 break; |
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|
1049 default: |
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|
1050 fprintf(stderr, "Unrecognized debugger command %s\n", input_buf); |
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|
1051 break; |
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1052 } |
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1053 } |
ebcbdd1c4cc8
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|
1054 return context; |
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|
1055 } |
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|
1056 |
288
a8ee7934a1f8
Add a YM2612 stub implementation with just timers and status registers so that games that depend on it can run.
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280
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|
1057 void init_run_cpu(genesis_context * gen, int debug, FILE * address_log) |
211 | 1058 { |
1059 m68k_context context; | |
1060 x86_68k_options opts; | |
288
a8ee7934a1f8
Add a YM2612 stub implementation with just timers and status registers so that games that depend on it can run.
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280
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|
1061 gen->m68k = &context; |
343
467bfa17004a
Mostly working runtime generation of memory map read/write functions
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342
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|
1062 memmap_chunk memmap[] = { |
467bfa17004a
Mostly working runtime generation of memory map read/write functions
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342
diff
changeset
|
1063 {0, 0x400000, 0xFFFFFF, 0, MMAP_READ | MMAP_WRITE, cart, |
467bfa17004a
Mostly working runtime generation of memory map read/write functions
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diff
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|
1064 NULL, NULL, NULL, NULL}, |
467bfa17004a
Mostly working runtime generation of memory map read/write functions
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342
diff
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|
1065 {0xE00000, 0x1000000, 0xFFFF, 0, MMAP_READ | MMAP_WRITE | MMAP_CODE, ram, |
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|
1066 NULL, NULL, NULL, NULL}, |
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1067 {0xC00000, 0xE00000, 0x1FFFFF, 0, 0, NULL, |
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1068 (read_16_fun)vdp_port_read, (write_16_fun)vdp_port_write, |
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1069 (read_8_fun)vdp_port_read_b, (write_8_fun)vdp_port_write_b}, |
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1070 {0xA00000, 0xA12000, 0x1FFFF, 0, 0, NULL, |
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1071 (read_16_fun)io_read_w, (write_16_fun)io_write_w, |
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1072 (read_8_fun)io_read, (write_8_fun)io_write} |
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1073 }; |
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1074 init_x86_68k_opts(&opts, memmap, sizeof(memmap)/sizeof(memmap_chunk)); |
211 | 1075 opts.address_log = address_log; |
1076 init_68k_context(&context, opts.native_code_map, &opts); | |
1077 | |
288
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1078 context.video_context = gen->vdp; |
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1079 context.system = gen; |
211 | 1080 //cartridge ROM |
1081 context.mem_pointers[0] = cart; | |
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1082 context.target_cycle = context.sync_cycle = mclks_per_frame/MCLKS_PER_68K; |
211 | 1083 //work RAM |
1084 context.mem_pointers[1] = ram; | |
1085 uint32_t address; | |
1086 /*address = cart[0x68/2] << 16 | cart[0x6A/2]; | |
1087 translate_m68k_stream(address, &context); | |
1088 address = cart[0x70/2] << 16 | cart[0x72/2]; | |
1089 translate_m68k_stream(address, &context); | |
1090 address = cart[0x78/2] << 16 | cart[0x7A/2]; | |
1091 translate_m68k_stream(address, &context);*/ | |
1092 address = cart[2] << 16 | cart[3]; | |
1093 translate_m68k_stream(address, &context); | |
1094 if (debug) { | |
1095 insert_breakpoint(&context, address, (uint8_t *)debugger); | |
1096 } | |
1097 m68k_reset(&context); | |
1098 } | |
1099 | |
340
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1100 char title[64]; |
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1101 |
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1102 #define TITLE_START 0x150 |
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1103 #define TITLE_END (TITLE_START+48) |
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1104 |
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1105 void update_title() |
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1106 { |
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1107 uint16_t *last = cart + TITLE_END/2 - 1; |
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1108 while(last > cart + TITLE_START/2 && *last == 0x2020) |
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1109 { |
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1110 last--; |
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1111 } |
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1112 uint16_t *start = cart + TITLE_START/2; |
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1113 char *cur = title; |
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1114 char last_char = ' '; |
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1115 for (; start != last; start++) |
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1116 { |
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1117 if ((last_char != ' ' || (*start >> 8) != ' ') && (*start >> 8) < 0x80) { |
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1118 *(cur++) = *start >> 8; |
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1119 last_char = *start >> 8; |
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1120 } |
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1121 if (last_char != ' ' || (*start & 0xFF) != ' ' && (*start & 0xFF) < 0x80) { |
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1122 *(cur++) = *start; |
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1123 last_char = *start & 0xFF; |
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1124 } |
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|
1125 } |
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|
1126 *(cur++) = *start >> 8; |
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1127 if ((*start & 0xFF) != ' ') { |
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1128 *(cur++) = *start; |
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|
1129 } |
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|
1130 strcpy(cur, " - BlastEm"); |
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|
1131 } |
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1132 |
341
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1133 #define REGION_START 0x1F0 |
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|
1134 |
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|
1135 int detect_specific_region(char region) |
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diff
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|
1136 { |
346
aff29d50afd5
Fix a region detection bug
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345
diff
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|
1137 return (cart[REGION_START/2] & 0xFF) == region || (cart[REGION_START/2] >> 8) == region || (cart[REGION_START/2+1] & 0xFF) == region; |
341
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diff
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|
1138 } |
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diff
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|
1139 |
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|
1140 void detect_region() |
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diff
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|
1141 { |
343
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|
1142 if (detect_specific_region('U')|| detect_specific_region('B') || detect_specific_region('4')) { |
341
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|
1143 version_reg = NO_DISK | USA; |
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1144 } else if (detect_specific_region('J')) { |
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|
1145 version_reg = NO_DISK | JAP; |
343
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|
1146 } else if (detect_specific_region('E') || detect_specific_region('A')) { |
341
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|
1147 version_reg = NO_DISK | EUR; |
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|
1148 } |
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diff
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|
1149 } |
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|
1150 |
88
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|
1151 int main(int argc, char ** argv) |
c339559f1d4f
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diff
changeset
|
1152 { |
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diff
changeset
|
1153 if (argc < 2) { |
c339559f1d4f
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parents:
diff
changeset
|
1154 fputs("Usage: blastem FILENAME\n", stderr); |
c339559f1d4f
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parents:
diff
changeset
|
1155 return 1; |
c339559f1d4f
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parents:
diff
changeset
|
1156 } |
c339559f1d4f
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diff
changeset
|
1157 if(!load_rom(argv[1])) { |
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Forgot to add blastem main file earlier
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parents:
diff
changeset
|
1158 fprintf(stderr, "Failed to open %s for reading\n", argv[1]); |
c339559f1d4f
Forgot to add blastem main file earlier
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parents:
diff
changeset
|
1159 return 1; |
c339559f1d4f
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diff
changeset
|
1160 } |
341
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340
diff
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|
1161 detect_region(); |
184
ebcbdd1c4cc8
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166
diff
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|
1162 int width = -1; |
ebcbdd1c4cc8
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166
diff
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|
1163 int height = -1; |
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diff
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|
1164 int debug = 0; |
197
7c227a8ec53d
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195
diff
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|
1165 FILE *address_log = NULL; |
184
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|
1166 for (int i = 2; i < argc; i++) { |
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|
1167 if (argv[i][0] == '-') { |
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|
1168 switch(argv[i][1]) { |
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1169 case 'd': |
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|
1170 debug = 1; |
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1171 break; |
338
5c34a9c39394
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|
1172 case 'f': |
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|
1173 frame_limit = 0; |
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|
1174 break; |
197
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|
1175 case 'l': |
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|
1176 address_log = fopen("address.log", "w"); |
7c227a8ec53d
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|
1177 break; |
215
2b1c2c28b261
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211
diff
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|
1178 case 'v': |
2b1c2c28b261
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211
diff
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|
1179 headless = 1; |
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211
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|
1180 break; |
265
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264
diff
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|
1181 case 'n': |
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264
diff
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|
1182 z80_enabled = 0; |
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264
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|
1183 break; |
341
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|
1184 case 'r': |
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|
1185 i++; |
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|
1186 if (i >= argc) { |
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|
1187 fputs("-r must be followed by region (J, U or E)\n", stderr); |
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|
1188 return 1; |
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|
1189 } |
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|
1190 switch (argv[i][0]) |
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|
1191 { |
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diff
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|
1192 case 'j': |
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diff
changeset
|
1193 case 'J': |
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|
1194 version_reg = NO_DISK | JAP; |
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|
1195 break; |
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diff
changeset
|
1196 case 'u': |
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diff
changeset
|
1197 case 'U': |
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diff
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|
1198 version_reg = NO_DISK | USA; |
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diff
changeset
|
1199 break; |
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diff
changeset
|
1200 case 'e': |
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diff
changeset
|
1201 case 'E': |
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diff
changeset
|
1202 version_reg = NO_DISK | EUR; |
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diff
changeset
|
1203 break; |
6ad8e36de685
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diff
changeset
|
1204 default: |
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Mike Pavone <pavone@retrodev.com>
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1205 fprintf(stderr, "'%c' is not a valid region character for the -r option\n", argv[i][0]); |
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|
1206 return 1; |
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|
1207 } |
6ad8e36de685
Support regions other than USA
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diff
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|
1208 break; |
184
ebcbdd1c4cc8
Fix a bunch of bugs in the CPU core, add a 68K debugger
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parents:
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diff
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|
1209 default: |
ebcbdd1c4cc8
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Mike Pavone <pavone@retrodev.com>
parents:
166
diff
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|
1210 fprintf(stderr, "Unrecognized switch %s\n", argv[i]); |
ebcbdd1c4cc8
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Mike Pavone <pavone@retrodev.com>
parents:
166
diff
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|
1211 return 1; |
ebcbdd1c4cc8
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parents:
166
diff
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1212 } |
ebcbdd1c4cc8
Fix a bunch of bugs in the CPU core, add a 68K debugger
Mike Pavone <pavone@retrodev.com>
parents:
166
diff
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|
1213 } else if (width < 0) { |
ebcbdd1c4cc8
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Mike Pavone <pavone@retrodev.com>
parents:
166
diff
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|
1214 width = atoi(argv[i]); |
ebcbdd1c4cc8
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parents:
166
diff
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|
1215 } else if (height < 0) { |
ebcbdd1c4cc8
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Mike Pavone <pavone@retrodev.com>
parents:
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diff
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|
1216 height = atoi(argv[i]); |
88
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|
1217 } |
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|
1218 } |
340
58a085cfc6bd
Set window title based on ROM header name
Mike Pavone <pavone@retrodev.com>
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338
diff
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|
1219 update_title(); |
184
ebcbdd1c4cc8
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diff
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|
1220 width = width < 320 ? 320 : width; |
ebcbdd1c4cc8
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Mike Pavone <pavone@retrodev.com>
parents:
166
diff
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|
1221 height = height < 240 ? (width/320) * 240 : height; |
215
2b1c2c28b261
Added headless flag to avoid initializing SDL and opening a window when running tests.
Mike Pavone <pavone@retrodev.com>
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211
diff
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|
1222 if (!headless) { |
340
58a085cfc6bd
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diff
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|
1223 render_init(width, height, title); |
215
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diff
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|
1224 } |
342
13f994c88c34
Get frame time correct and frame rate sort of correct for EUR region
Mike Pavone <pavone@retrodev.com>
parents:
341
diff
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|
1225 if (version_reg & 0x40) { |
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341
diff
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|
1226 mclks_per_frame = MCLKS_LINE * LINES_PAL; |
13f994c88c34
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341
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|
1227 render_fps(50); |
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1228 } |
88
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diff
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|
1229 vdp_context v_context; |
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parents:
diff
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|
1230 |
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|
1231 init_vdp_context(&v_context); |
260
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Initial stab at integartiong Z80 core
Mike Pavone <pavone@retrodev.com>
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1232 |
288
a8ee7934a1f8
Add a YM2612 stub implementation with just timers and status registers so that games that depend on it can run.
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|
1233 ym2612_context y_context; |
a8ee7934a1f8
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parents:
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1234 ym_init(&y_context); |
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1235 |
260
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|
1236 z80_context z_context; |
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diff
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|
1237 x86_z80_options z_opts; |
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parents:
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diff
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|
1238 init_x86_z80_opts(&z_opts); |
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parents:
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1239 init_z80_context(&z_context, &z_opts); |
290
171f97e70d85
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|
1240 |
171f97e70d85
Implement writes from Z80 to YM-2612
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|
1241 genesis_context gen; |
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289
diff
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|
1242 |
171f97e70d85
Implement writes from Z80 to YM-2612
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289
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|
1243 z_context.system = &gen; |
260
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215
diff
changeset
|
1244 z_context.mem_pointers[0] = z80_ram; |
342
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Mike Pavone <pavone@retrodev.com>
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|
1245 z_context.sync_cycle = z_context.target_cycle = mclks_per_frame/MCLKS_PER_Z80; |
260
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parents:
215
diff
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|
1246 z_context.int_cycle = CYCLE_NEVER; |
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|
1247 z_context.mem_pointers[1] = z_context.mem_pointers[2] = (uint8_t *)cart; |
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diff
changeset
|
1248 |
288
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Add a YM2612 stub implementation with just timers and status registers so that games that depend on it can run.
Mike Pavone <pavone@retrodev.com>
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diff
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|
1249 gen.z80 = &z_context; |
a8ee7934a1f8
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Mike Pavone <pavone@retrodev.com>
parents:
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|
1250 gen.vdp = &v_context; |
a8ee7934a1f8
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Mike Pavone <pavone@retrodev.com>
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|
1251 gen.ym = &y_context; |
a8ee7934a1f8
Add a YM2612 stub implementation with just timers and status registers so that games that depend on it can run.
Mike Pavone <pavone@retrodev.com>
parents:
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diff
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|
1252 |
a8ee7934a1f8
Add a YM2612 stub implementation with just timers and status registers so that games that depend on it can run.
Mike Pavone <pavone@retrodev.com>
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280
diff
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|
1253 init_run_cpu(&gen, debug, address_log); |
88
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Mike Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
1254 return 0; |
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parents:
diff
changeset
|
1255 } |